RELATIONSHIP BETWEEN PRECIPITATION IN MAY OVER YUNNAN AND THE CHANGES OF TROPICAL SEA SURFACE TEMPERATURE AND ASIA MONSOON

Based on correlation analysis and composition analysis, the relationship between precipitation in May over Yunnan and the changes of tropical sea surface temperature and tropical convection and Asia monsoon are studied. The results indicate that these large-scale climate variations strongly influence the precipitation in May over Yunnan and disclose the different patterns when precipitation increases and decreases. Because the changes have significant continuity, it may be useful in forecasting the precipitation in May in Yunnan. The relationship between monsoon index from April to June over South Asia and precipitation in May over Yunnan is also studied. The results show that precipitation decreases when the monsoon index is lower and precipitation increases when the monsoon index is higher.